package github import ( "bufio" "bytes" "encoding/json" "fmt" "io" "io/ioutil" "math/rand" "net/http" "os" "regexp" "strconv" "strings" "syscall" "time" "github.com/pkg/errors" "golang.org/x/crypto/ssh/terminal" "github.com/MichaelMure/git-bug/bridge/core" "github.com/MichaelMure/git-bug/repository" ) const ( githubV3Url = "https://api.github.com" keyOwner = "owner" keyProject = "project" keyToken = "token" defaultTimeout = 60 * time.Second ) var ( ErrBadProjectURL = errors.New("bad project url") ) func (*Github) Configure(repo repository.RepoCommon, params core.BridgeParams) (core.Configuration, error) { conf := make(core.Configuration) var err error var token string var owner string var project string // getting owner and project name if params.Owner != "" && params.Project != "" { // first try to use params if both or project and owner are provided owner = params.Owner project = params.Project } else if params.URL != "" { // try to parse params URL and extract owner and project owner, project, err = splitURL(params.URL) if err != nil { return nil, err } } else { // remote suggestions remotes, err := repo.GetRemotes() if err != nil { return nil, err } // terminal prompt owner, project, err = promptURL(remotes) if err != nil { return nil, err } } // validate project owner ok, err := validateUsername(owner) if err != nil { return nil, err } if !ok { return nil, fmt.Errorf("invalid parameter owner: %v", owner) } // try to get token from params if provided, else use terminal prompt to either // enter a token or login and generate a new one if params.Token != "" { token = params.Token } else { token, err = promptTokenOptions(owner, project) if err != nil { return nil, err } } // verify access to the repository with token ok, err = validateProject(owner, project, token) if err != nil { return nil, err } if !ok { return nil, fmt.Errorf("project doesn't exist or authentication token has an incorrect scope") } conf[keyToken] = token conf[keyOwner] = owner conf[keyProject] = project return conf, nil } func (*Github) ValidateConfig(conf core.Configuration) error { if _, ok := conf[keyToken]; !ok { return fmt.Errorf("missing %s key", keyToken) } if _, ok := conf[keyOwner]; !ok { return fmt.Errorf("missing %s key", keyOwner) } if _, ok := conf[keyProject]; !ok { return fmt.Errorf("missing %s key", keyProject) } return nil } func requestToken(note, username, password string, scope string) (*http.Response, error) { return requestTokenWith2FA(note, username, password, "", scope) } func requestTokenWith2FA(note, username, password, otpCode string, scope string) (*http.Response, error) { url := fmt.Sprintf("%s/authorizations", githubV3Url) params := struct { Scopes []string `json:"scopes"` Note string `json:"note"` Fingerprint string `json:"fingerprint"` }{ Scopes: []string{scope}, Note: note, Fingerprint: randomFingerprint(), } data, err := json.Marshal(params) if err != nil { return nil, err } req, err := http.NewRequest("POST", url, bytes.NewBuffer(data)) if err != nil { return nil, err } req.SetBasicAuth(username, password) req.Header.Set("Content-Type", "application/json") if otpCode != "" { req.Header.Set("X-GitHub-OTP", otpCode) } client := &http.Client{ Timeout: defaultTimeout, } return client.Do(req) } func decodeBody(body io.ReadCloser) (string, error) { data, _ := ioutil.ReadAll(body) aux := struct { Token string `json:"token"` }{} err := json.Unmarshal(data, &aux) if err != nil { return "", err } if aux.Token == "" { return "", fmt.Errorf("no token found in response: %s", string(data)) } return aux.Token, nil } func randomFingerprint() string { // Doesn't have to be crypto secure, it's just to avoid token collision rand.Seed(time.Now().UnixNano()) var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ") b := make([]rune, 32) for i := range b { b[i] = letterRunes[rand.Intn(len(letterRunes))] } return string(b) } func promptTokenOptions(owner, project string) (string, error) { for { fmt.Println() fmt.Println("[1]: user provided token") fmt.Println("[2]: interactive token creation") fmt.Print("Select option: ") line, err := bufio.NewReader(os.Stdin).ReadString('\n') fmt.Println() if err != nil { return "", err } line = strings.TrimRight(line, "\n") index, err := strconv.Atoi(line) if err != nil || (index != 1 && index != 2) { fmt.Println("invalid input") continue } if index == 1 { return promptToken() } return loginAndRequestToken(owner, project) } } func promptToken() (string, error) { fmt.Println("You can generate a new token by visiting https://github.com/settings/tokens.") fmt.Println("Choose 'Generate new token' and set the necessary access scope for your repository.") fmt.Println() fmt.Println("The access scope depend on the type of repository.") fmt.Println("Public:") fmt.Println(" - 'public_repo': to be able to read public repositories") fmt.Println("Private:") fmt.Println(" - 'repo' : to be able to read private repositories") fmt.Println() re, err := regexp.Compile(`^[a-zA-Z0-9]{40}`) if err != nil { panic("regexp compile:" + err.Error()) } for { fmt.Print("Enter token: ") line, err := bufio.NewReader(os.Stdin).ReadString('\n') if err != nil { return "", err } token := strings.TrimRight(line, "\n") if re.MatchString(token) { return token, nil } fmt.Println("token is invalid") } } func loginAndRequestToken(owner, project string) (string, error) { fmt.Println("git-bug will now generate an access token in your Github profile. Your credential are not stored and are only used to generate the token. The token is stored in the repository git config.") fmt.Println() fmt.Println("The access scope depend on the type of repository.") fmt.Println("Public:") fmt.Println(" - 'public_repo': to be able to read public repositories") fmt.Println("Private:") fmt.Println(" - 'repo' : to be able to read private repositories") fmt.Println() // prompt project visibility to know the token scope needed for the repository isPublic, err := promptProjectVisibility() if err != nil { return "", err } username, err := promptUsername() if err != nil { return "", err } password, err := promptPassword() if err != nil { return "", err } var scope string if isPublic { // public_repo is requested to be able to read public repositories scope = "public_repo" } else { // 'repo' is request to be able to read private repositories // /!\ token will have read/write rights on every private repository you have access to scope = "repo" } // Attempt to authenticate and create a token note := fmt.Sprintf("git-bug - %s/%s", owner, project) resp, err := requestToken(note, username, password, scope) if err != nil { return "", err } defer resp.Body.Close() // Handle 2FA is needed OTPHeader := resp.Header.Get("X-GitHub-OTP") if resp.StatusCode == http.StatusUnauthorized && OTPHeader != "" { otpCode, err := prompt2FA() if err != nil { return "", err } resp, err = requestTokenWith2FA(note, username, password, otpCode, scope) if err != nil { return "", err } defer resp.Body.Close() } if resp.StatusCode == http.StatusCreated { return decodeBody(resp.Body) } b, _ := ioutil.ReadAll(resp.Body) return "", fmt.Errorf("error creating token %v: %v", resp.StatusCode, string(b)) } func promptUsername() (string, error) { for { fmt.Print("username: ") line, err := bufio.NewReader(os.Stdin).ReadString('\n') if err != nil { return "", err } line = strings.TrimRight(line, "\n") ok, err := validateUsername(line) if err != nil { return "", err } if ok { return line, nil } fmt.Println("invalid username") } } func promptURL(remotes map[string]string) (string, string, error) { validRemotes := getValidGithubRemoteURLs(remotes) if len(validRemotes) > 0 { for { fmt.Println("\nDetected projects:") // print valid remote github urls for i, remote := range validRemotes { fmt.Printf("[%d]: %v\n", i+1, remote) } fmt.Printf("\n[0]: Another project\n\n") fmt.Printf("Select option: ") line, err := bufio.NewReader(os.Stdin).ReadString('\n') if err != nil { return "", "", err } line = strings.TrimRight(line, "\n") index, err := strconv.Atoi(line) if err != nil || (index < 0 && index >= len(validRemotes)) { fmt.Println("invalid input") continue } // if user want to enter another project url break this loop if index == 0 { break } // get owner and project with index owner, project, _ := splitURL(validRemotes[index-1]) return owner, project, nil } } // manually enter github url for { fmt.Print("Github project URL: ") line, err := bufio.NewReader(os.Stdin).ReadString('\n') if err != nil { return "", "", err } line = strings.TrimRight(line, "\n") if line == "" { fmt.Println("URL is empty") continue } // get owner and project from url owner, project, err := splitURL(line) if err != nil { fmt.Println(err) continue } return owner, project, nil } } // splitURL extract the owner and project from a github repository URL. It will remove the // '.git' extension from the URL before parsing it. // Note that Github removes the '.git' extension from projects names at their creation func splitURL(url string) (owner string, project string, err error) { cleanURL := strings.TrimSuffix(url, ".git") re, err := regexp.Compile(`github\.com[/:]([a-zA-Z0-9\-_]+)/([a-zA-Z0-9\-_.]+)`) if err != nil { panic("regexp compile:" + err.Error()) } res := re.FindStringSubmatch(cleanURL) if res == nil { return "", "", ErrBadProjectURL } owner = res[1] project = res[2] return } func getValidGithubRemoteURLs(remotes map[string]string) []string { urls := make([]string, 0, len(remotes)) for _, url := range remotes { // split url can work again with shortURL owner, project, err := splitURL(url) if err == nil { shortURL := fmt.Sprintf("%s/%s/%s", "github.com", owner, project) urls = append(urls, shortURL) } } return urls } func validateUsername(username string) (bool, error) { url := fmt.Sprintf("%s/users/%s", githubV3Url, username) client := &http.Client{ Timeout: defaultTimeout, } resp, err := client.Get(url) if err != nil { return false, err } err = resp.Body.Close() if err != nil { return false, err } return resp.StatusCode == http.StatusOK, nil } func validateProject(owner, project, token string) (bool, error) { url := fmt.Sprintf("%s/repos/%s/%s", githubV3Url, owner, project) req, err := http.NewRequest("GET", url, nil) if err != nil { return false, err } // need the token for private repositories req.Header.Set("Authorization", fmt.Sprintf("token %s", token)) client := &http.Client{ Timeout: defaultTimeout, } resp, err := client.Do(req) if err != nil { return false, err } err = resp.Body.Close() if err != nil { return false, err } return resp.StatusCode == http.StatusOK, nil } func promptPassword() (string, error) { for { fmt.Print("password: ") bytePassword, err := terminal.ReadPassword(int(syscall.Stdin)) // new line for coherent formatting, ReadPassword clip the normal new line // entered by the user fmt.Println() if err != nil { return "", err } if len(bytePassword) > 0 { return string(bytePassword), nil } fmt.Println("password is empty") } } func prompt2FA() (string, error) { for { fmt.Print("two-factor authentication code: ") byte2fa, err := terminal.ReadPassword(int(syscall.Stdin)) fmt.Println() if err != nil { return "", err } if len(byte2fa) > 0 { return string(byte2fa), nil } fmt.Println("code is empty") } } func promptProjectVisibility() (bool, error) { for { fmt.Println("[1]: public") fmt.Println("[2]: private") fmt.Print("repository visibility: ") line, err := bufio.NewReader(os.Stdin).ReadString('\n') fmt.Println() if err != nil { return false, err } line = strings.TrimRight(line, "\n") index, err := strconv.Atoi(line) if err != nil || (index != 0 && index != 1) { fmt.Println("invalid input") continue } // return true for public repositories, false for private return index == 0, nil } }